RM35X0E _58 Vehicle Interior _078378 THEFT DETERRENT / KEYLESS ENTRY _0388156 THEFT DETERRENT SYSTEM J

THEFT DETERRENT / KEYLESS ENTRY  THEFT DETERRENT SYSTEM  Horn Circuit  


DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horn to sound at intervals of 0.4 seconds.

WIRING DIAGRAM

B530644E02
5.844,2.594 7,3.198 1.156,0.604 10 false Main Body ECU (Multiplex Network Body ECU) 5.854,2.396 7.01,3 1.156,0.604 10 false A 4.792,1.635 5.948,2.24 1.156,0.604 10 false 3C 4.781,1.854 5.844,2.406 1.063,0.552 10 false Instrument Panel Junction Block Assembly 4.51,0.833 5.667,1.438 1.156,0.604 10 false 27 5.719,0.844 6.875,1.448 1.156,0.604 10 false 28 5.938,0.833 7.094,1.438 1.156,0.604 10 false HORN 6.583,1.104 7.021,1.698 0.438,0.594 10 false IC 0.979,0.917 3.958,1.563 2.979,0.646 10 false from Horn Relay Assembly (HORN)

CAUTION / NOTICE / HINT

NOTICE:

w/ Entry and Start System:

If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.


PROCEDURE

1.CHECK HORNS OPERATION
a.

Press the horn switch and check if the horns sound.


Result:
Proceed to
Horns sound
Horns do not sound



Horns sound

2.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)

Horns do not sound

GO TO HORN SYSTEM

Click hereVehicle Exterior>HORN>HORN SYSTEM>PROBLEM SYMPTOMS TABLE


2.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)
a.

Disconnect the instrument panel junction block assembly connector.


b.
B540008C02
1.531,0.344 1.885,0.635 0.354,0.292 1.625,0.417 1.938,0.615 0.313,0.198 10 false 3C 0.25,0.281 0.563,0.479 0.313,0.198 10 false *a
*a Front view of wire harness connector
(to Instrument Panel Junction Block Assembly)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
3C-27 - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

3.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
a.

Remove the instrument panel junction block assembly.

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


b.
B468454N02
1.458,0.188 1.917,0.5 0.458,0.313 1.448,1.594 1.906,1.906 0.458,0.313 1.646,0.292 1.865,0.5 0.219,0.208 10 false A 1.594,1.677 1.844,1.865 0.25,0.188 10 false 3C

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3C-27 - A-28 (HORN) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL